1
DESCRIPTION
The Total Access 1248 is a mini-DSLAM that accepts up to
eight T1 network feeds assigned to a single IMA group.
Inverse Multiplexing over ATM (IMA) is a technology used to
bond multiple (DS1) links into a single data pipe.
The Total Access 1248 provides ADSL2+ service for up to 48
subscribers per unit. Plain Old Telephone Service (POTS) is
brought in from an on-board splitter and is placed on the
same pair as the ADSL2+ signal. Since ADSL2+ and POTS are
transported on the same twisted pair, the subscriber must use
a low-pass filter on the line before attempting to use analog
services. The lines are configured for service with flow-through
provisioning using a network configuration application such
as Telcordia’s Network Configuration (NCON). Permanent
Virtual Circuits (PVCs) in the ATM network to the subscriber’s
chosen Internet Service Provider (ISP) allow the subscriber
access to the internet.
The Total Access 1248 is rack-mountable and measures 1.75
inches (1U) high, 17.25 inches wide, and 11.125 inches deep
(measurements do not include the mounting brackets). The
device may be powered using one or two –48 VDC sources, one
for a non-redundant power configuration, two for a redundant
power configuration.
REQUIRED TOOLS
The following tools and materials are required to install the
Total Access 1248:
♦ Wire-wrap tool
♦ #2 phillips-head screwdriver
♦ #1 phillips-head screwdriver
♦ Straight-slot screwdriver
♦ Multimeter (ohmmeter and voltmeter)
♦ Crimping tool for ground and power lugs
♦ Wire strippers and side cutters
MOUNTING THE TOTAL ACCESS 1248
The Total Access 1248 is shipped with two sets of mounting
brackets that accommodate either a 19-inch or 23-inch rack.
♦ The mounting brackets used for a 19-inch rack are
P/N 3265540.
♦ The mounting brackets used for a 23-inch rack are
P/N 3265541.
Attach the mounting brackets to the front of a rack for both
flush or mid-mount configurations.
Total Access 1248
Octal T1 IMA DSLAM
TOTAL ACCESS 1248 CONNECTIONS
The following sections describe the Total Access 1248 ground
connections and power connections.
Ground Connection
The ground wire can be 12 to 18 AWG,
however, it must be equal to or greater
than the wire gauge used for power.
The Total Access 1248 must be
grounded to a reliable grounding
source.
To connect the ground wire, perform
the following steps:
1. Connect the ground wire (fitted
with a loop terminal end) to the
ground lug on the front of the Total Access 1248.
2. Clean the surface of the frame ground source and
apply an appropriate antioxidant.
3. Connect the other end of the ground wire to the
grounded frame.
4. Using an ohmmeter, verify continuity between the
ground lug and a known good frame ground. The
reading should be less than 1 ohm.
Power Connection
The Total Access 1248 provides
redundant power inputs. Two
sources of –48 VDC must be
provided to use the redundant
power feature. The power wires
must be 12 to 18 AWG stranded
copper. The Total Access 1248
uses a four-point terminal block
to accept the –48 VDC and –48
VDC RET leads.
NOTE
If a non-redundant power configuration is required, use the
connections marked –48 VDC A and –48 VDC A RET.
FRONT
BACK
Mid Mount
Flush Mount
23-inch Mounting Brackets
19-inch Mounting Brackets
FAN MODULE
1179675G1
-48 VDC B RET
-48 VDC A RET
-48 VDC A
-48 VDC B
Issue Date: 0905
Document P/N: 61179641L4-22A
FAN MODULE
1179675G1
ALARM
CRAFT
PWR
ALM
1179641L4
TOP:POTS BOTTOM: ADSL+POTS PORTS 1-24
TOP:POTS BOTTOM: ADSL+POTS PORTS 25-48
ETHERNET
OUT
EXPANSION
T1/E1 1-8
-48V
.....
,5.0A
USE COPPER CONDUCTORS ONLY!
T1/E1
A B
-48V RET -48V RET
5
6
7
8
CLEI: VAMBDOOA _ _
Product P/N: 1179641L4
(292 pages)
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